#include <bits/stdc++.h>

using namespace std;

ifstream fin("matrice2.in");
ofstream fout("matrice2.out");

const int NMAX(305), QMAX(20005);
map<int, int> mp;
vector<pair<int, int> > vec[NMAX * NMAX];

int cnt, cnvB[NMAX * NMAX], X1, Y1, X2, Y2, n, q, nrP, mat[NMAX][NMAX], aux[NMAX][NMAX], rez[QMAX];
const int dx[] = {-1, 0, 1, 0};
const int dy[] = {0, 1, 0, -1};

struct DSU {
  vector<int> p, sz;

  DSU(int n) {
    p.resize(n + 1);
    iota(p.begin(), p.end(), 0);
    sz.assign(n + 1, 1);
  }

  int root(int x) {
    if (x == p[x]) {
      return x;
    }
    return p[x] = root(p[x]);
  }

  bool unite(int u, int v) {
    int x = root(u), y = root(v);
    if (x == y) {
      return false;
    }
    if (sz[x] > sz[y]) {
      swap(x, y);
    }
    p[x] = y;
    sz[y] += sz[x];
    return true;
  }
};

int getId(int x, int y)
{
    return (x - 1) * n + y;
}

int main()
{
    fin >> n >> q;

    set<int> s;
    for(int i = 1; i <= n; ++i)
        for(int j = 1; j <= n; ++j)
        {
            fin >> mat[i][j];
            s.insert(mat[i][j]);
        }
    for(auto it: s)
    {
        mp[it] = ++cnt;
        cnvB[cnt] = it;
    }
    for(int i = 1; i <= n; ++i)
        for(int j = 1; j <= n; ++j)
        {
            mat[i][j] = mp[mat[i][j]];
            vec[mat[i][j]].push_back({i, j});
        }

    vector<pair<int, int > > query;
    query.push_back({0, 0});
    for(int i = 1; i <= q; ++i)
    {
        fin >> X1 >> Y1 >> X2 >> Y2;
        query.push_back({getId(X1, Y1), getId(X2, Y2)});
    }

    nrP = 0;
    int step = 1;
    for(; step < cnt; step <<= 1);
    while(step)
    {
        vector<int> aq(q + 1, 0), parcg[cnt + 1];
        for(int i = 1; i <= q; ++i)
            if(rez[i] + step <= cnt)
            {
                aq[i] = rez[i] + step;
                parcg[aq[i]].push_back(i);
            }
        DSU Arb(n * n);
        ++nrP;
        for(int i = cnt; i >= 1; --i)
        {
            for(auto it: vec[i])
            {
                aux[it.first][it.second] = nrP;
                for(int k = 0; k < 4; ++k)
                {
                    int newX = it.first + dx[k];
                    int newY = it.second + dy[k];
                    if(aux[newX][newY] == nrP)
                        Arb.unite(getId(it.first, it.second), getId(newX, newY));
                }
            }
            for(auto it: parcg[i])
                if(Arb.root(query[it].first) == Arb.root(query[it].second))
                    rez[it] = aq[it];
        }
        step >>= 1;
    }
    for(int i = 1; i <= q; ++i)
        fout << cnvB[rez[i]] << '\n';
    return 0;
}